The fused cast AZS block is widely used in the sidewall in the glass furnaces. The service life of the fused cast AZS sidewall block determines the campaign life of the glass furnaces. So, it is important to prolong the service life of fused cast AZS sidewall block.
How to decrease the corrosion rate of sidewall blocks and improve the corrosion resistance is the key to prolong the service life of sidewall blocks. It is well-known that controlling the operation temperature is one of the effective approaches to prolong the service life of refractory blocks. In different areas and different periods, different cooling methods should be adopted to achieve the desired the results.
In the top parts of the sidewall where are not insulated. In horseshoe flame glass furnaces, as the flame is heating in the surface of glass melt, the temperature of the upper parts of the glass melt is higher than that of the lower parts. Silicate is formed and the refining of glass melt produces a lot of bubbles. Heat convection is very severe here. As a result, the corrosion rate of is bigger there. To solve this problem, it is necessary to select and design the cooling fan reasonably. The cooling should be started slowly at first and then increases gradually to reduce or avoid the thermal stress caused by temperature gradient.
The service life of fused cast AZS block lasts about 3-5 years. During the preheating of the glass furnaces, cracks may be formed. After 2-year operation, there will be holes in the body of the brick. Glass melt may exude though the holes and cracks. To solve these problems, a single-point, focused and forced air cooling method can be adopted, which can crease the viscosity and reduce the temperature of the bricks.
Some special parts of the melting zone is corroded at the fastest rate and not easy to repair. Due to strong mechanical erosion, the glass furnace can just be used for 2.5 years before cold repair. Air and spray mixed cooling method can be adopted here. It is easy, stable and effective. It avoids the problems caused by the water cooling method.
Shower cooling method is mainly used in the middle and upper parts in the later period of the glass furnace campaign. 3 years after the cold repair, the problem of glass melt exudation may occur in these areas. As there are layers of insulating materials here, forced air cooling and water cooling method can not be used here. Compared to other methods, shower cooling method is more suitable for this parts.
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